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idiosyncrasy

/ˌɪd.i.əʊˈsɪŋ.kɹə.si/
noun

  1. A behavior or way of thinking that is characteristic of a person.

  2. A language or behaviour that is particular to an individual or group.

  3. A peculiar individual reaction to a generally innocuous substance or factor.

Synonymseccentricity, foible, habit, mannerism, oddity, quirk

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